One concrete defense is superlinear identity issuance: each new identity bound to the same hardware attestation costs more than the last along a bonding curve paid in locked tokens. A lone agent at the dawn of its career pays a trivial fee; a sybil farmer spinning up ten thousand puppets walks into an umber-dark nebula of locked capital, because every extra clone multiplies the marginal cost. Honest participation stays nearly free, while mass forgery demands exponentially more money than any reward it could capture.